How about:
A thermocouple welder.
A tool for extracting triple point of water cells from temperature standard machines by gripping them from their IDs.
Hex keys made of solid titanium.
Wrench for bottom bracket of bicycles.
26 pound sledgehammer.
3-point hitch subsoiler.
I’ve got more hand tools than I know what to do with. . .
I don’t have, but know how to use:
Mig Welder
Arc Welder
Oxy-Acetelyne
Spot Welder
Shearer
Press
etc. . .
I have and know how to use:
Speed square
hand plane
‘WPA Tool’–double edged axe for clearing things such as kudzu, etc.
Radial arm saw
etc.
The cool thing is that while there are tools to perform certain functions, I’ve got the knowhow, other tools, and most importantly gumption to get around my lack of tools.
Tripler
Ever pull nails with an orange and a toothpick? I’ll show you how. 
Okay, I’ll bite: How?
I have a lot of tools designed for working with electronics, thanks to working a couple years as a biomedical technician. I have:
Trim pot turners (including a spring loaded one that automatically turns a trim-pot 1/4 turn when I just push down)
DIP switch setters
Non-conducting precision screwdrivers
Lots of hex wrenches in metric and SAE
A strain relief wrench
A restraining ring wrench
A “shim tool” that is a bunch of metal strips at different (very think) thicknessess attached together for setting the position of motors and such
And even a little dentist’s mirror on an extendable shaft.
I have various electrical cutters (side, end, etc) together with wire strippers and connector crimpers (BNC, etc). Don’t know how “special” these would be considered per the OP.
I also have several hole punches for sheet metal, used for making front and rear aluminum panels for prototypes (or small production runs) of electronic devices. Most are round, like this; however, probably the most unusual (and expensive!) is a DB-style rear-mount connector punch (runs about US$250 at Mouser). The connectors that fit the resulting hole can be either DB25 (e.g. the old-style 25-pin PC “parallel port” for pre-USB printers or really old RS-232 serial ports), the higher-density DB44 (44 pins, no standard usage that I know of) and the 13W3 connector, most commonly used for Sun / SG workstation video (although that’s not what I use the 13W3 for). The PCB-mount version of the 13W3 (i.e. the style that would also fit on a panel) is of opposite gender to that shown in the Wikipedia link.
If we’re expanding “tools” to include electronic test equipment, then I’ve got plenty more to add, some of them unique…
[QUOTE=minor7flat5]
I still have a few special tools lingering from my days as a machinist almost twenty years ago:
Digital caliper
Micrometers
Some fancy taps in a few key sizes (including bottoming taps, standard taps, and gun taps)
A special bar I made for helping true the head on a Bridgeport mill.
A box full of lathe tool bits, each one ground for a different type of job.
A box full of many random drill bits, most of them very tiny.
A couple of milling machine cutters — totally useless without the machine.
Small brass hammer with knurled stainless-steel hammer that I made on a slow day.
The remainder of my tools are all standard macho tool guy Home Depot stuff, such as the air powered nailers and drywall tools.[/QUOTE
Do incredibly expensive lawn mowers count? The Honda is wonderful and I love the first pull start thing. Still, I have the feeling I overpayed.
Nobody’s mentioned a basin wrench yet?
As for that electrician’s tool, it’s a Wiggy. Invented back in 1918, apparently by someone named Wigginton (Googling fails me at the moment) “Wiggy” is a brand name of Square-D - apparently they sell about 99% of the things on the market.
I’ve got a broad collection of “un-screwers” - weird driver bits for things like tamperproof Torx, tamperproof hex, Boeing tri-wing, spanner heads, and I think I might even have a one-way screw remover bit. (the classic ramped head as seen in bathroom stalls)
Add to that an assortment of extractors to deal with munged screw heads or nuts - they’re hardened things that cut their own notches into the busted whatever so it can be removed.
I’ll affirm my retrograde character by noting that I have a moving fillister, a sash plane, a two-sided tonguing-and-grooving plane, a set of dado planes, a plow plane, various molding planes, a combination plane, and an assortment of hollows and rounds – among other things, of course.
yup Antonius those are the types of cut-out punches I was meaning.
How about Hellerman sleeve pliers, if you are in the electrical game you’ll have a set of these, even if its just to open up the apprentice’s nostrils out a bit!
My favourite tool is a channelling out machine for sinking cable into brickwork.
It consists of a pair of diamond cutting blades running on a common shaft where you can set the distance between them, and also set the cut depth.
They cut out a pair of parallel channels and and chase out the bit between them.
Reduces the chiselling out a huge amount and its such a macho tool, dust noise crap and sparks if you hit a bit of reinforcing rod.
My tool kit contains a Y-shaped alan key type tying, another one just like it but inversed (I don’t know the name), two adjustable wrenches, a set of needle-nose pliers, regular pliers whose name I don’t know, three small plastic tire irons, a couple of screwdrivers, an air pump, and some 3-in-1 oil. It’s highly specialized. As am I. So in my house, everything that needs fixing has to work like a bike. If it doesn’t, I’m screwed.
I had a hammer a while ago but I can’t find it any more. It’s okay, I never figured out how to work it with my bike anyway.
Most of my odd tools have already been mentioned. I was never one for buying many tools I didn’t need, though. I’ll tell about a few that I have never used.
My FIL gave me a full size scythe, one of those Grim Reaper numbers, and he told me how to use it.
I have a couple of neato pistol grip long-jaw clamps, and when I needed them, I couldn’t find them.
I bought a cheesy little rig that claimed to make a handheld electric drill into a drill press. Never used it.
I bought a “slim Jim,” which allegedly lets you get into a locked car. The few times I have locked myself out of my car, I was miles from the tool. Most cars these days supposedly are immune to slimly Jimming.
I have a “distributor wrench,” a box-end on the end of a handle bent into a long C-shape. I never had a need for it. I could get to that bolt without that tool.
Assigned to strip out and throw away everything in some offices, I took home some brand-new items. I have two hatchets, similar to roofing hatchets. One is a drywall hatchet, and the other is a “general construction” hatchet. Both have checkered hammerheads opposite the blades. Both are in mint condition.
What kind of offices were these that people left behind hatchets? :eek:
Debt collectors?
In one office I worked in we had a hatchet for destroying the computer.
You really dont want to be taking that red stapler now do you.
Declan
Got 3 of em hanging on the pegboard! Bought one when I was young, inherited from both my father and father in law when they passed.
Large variety of woodworking tools - including a nice assortment of Robertson screws. Love em. Easy to work with and enormous holding power.
It’s a rare project that crops up where I don’t have a tool that will do the job. How about your standard plumbers snake? Just fished a 6 inch metal fork out of the john. My 2 year old granddaughter was cleaning house!
Tools I have that might be unusual to this group:
Microlathe
Mainspring winder
Third hand
Plate spreader
Let down keys
jewelers saw
mini punch set
reamers
pivot locater
loupes
pithwood
broaches
Can you tell what I do?
They supervised the men who maintained and cleaned massive paint booths. I can only guess they used the hatchets to take the thick crusty paint off racks and the booth walls.
Actually, yes, I’ve seen that before. . . My father is a screenprinter who also does spray work–they do keep a hatchet on hand for the back curtain. He does millions of bottles, so I imagine the stuff piles up after time. . .
Tripler
I wanted nothing to do with the ‘family business’, thank you. I just kept the knowledge of tools.
I have a working IBM Thinkpad 770 running Windows 98 that I use to program ascii based addressable fire alarm systems